function validateregistration(form) {
  var name = form.namereg.value;
  var username = form.usernamereg.value;
  var password = form.passwordreg.value;
  var confpassword = form.confpasswordreg.value;
  var email = form.emailreg.value;
     var nameRegex = /^[a-zA-Z]+([\s][a-zA-Z]+)*$/;
     var usernameRegex = /^[a-zA-Z0-9._]+$/;
     var dateRegex = /^(19|20)\d\d[-](0[1-9]|1[012])[-](0[1-9]|[12][0-9]|3[01])$/;
     var emailRegex = /^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$/;
     var photoRegex = /^.+\.(jpe?g|bmp|png)$/i;
  if(name=="") {
    inlineMsg('namereg','Invalid name. You must enter non empty name, minimal 5 characters, include letter and space only',2);
    return false;
  }
  if(name.length<5){
	inlineMsg('namereg','Invalid name. You must enter non empty name, minimal 5 characters, include letter and space only',2);
    return false;
  }
  if(!(name.match(nameRegex))){
	inlineMsg('namereg','Invalid name. You must enter non empty name, minimal 5 characters, include letter and space only',2);
    return false;
  }
  if(username == "") {
    inlineMsg('usernamereg','Invalid username. You must enter non empty username, minimal 5 characters, include letters, numbers, . , _ only',2);
    return false;
  }
  if(username.length<5){
    inlineMsg('usernamereg','Invalid username. You must enter non empty username, minimal 5 characters, include letters, numbers, . , _ only',2);
    return false;
  }
  if(!(username.match(usernameRegex))){
	inlineMsg('usernamereg','Invalid username. You must enter non empty username, minimal 5 characters, include letters, numbers, . , _ only',2);
    return false;
  }
  if((password=="") || (password!=confpassword) || password.length<6 ){
	inlineMsg('passwordreg','Invalid password. You must enter non empty username, minimal 6 characters',2);
    return false;
  }

  if(email == "") {
    inlineMsg('emailreg','Invalid email.',2);
    return false;
  }
  if(!(email.match(emailRegex))){
	inlineMsg('emailreg','Invalid email.',2);
    return false;
  }
  return true;
}
function validateediting(form) {
  var name = form.name.value;
  var username = form.username.value;

  var password = form.password.value;

  var confpassword = form.confpassword.value;

  var email = form.email.value;

  var date = form.date.value;

  var location = form.location.value;

 var nameRegex = /^[a-zA-Z]+([\s][a-zA-Z]+)*$/;
 var usernameRegex = /^[a-zA-Z0-9._]+$/;
 var dateRegex = /^(19|20)\d\d[-](0[1-9]|1[012])[-](0[1-9]|[12][0-9]|3[01])$/;
 var emailRegex = /^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$/;
 var photoRegex = /^.+\.(jpe?g|bmp|png)$/i;
  if(name=="") {
	
    inlineMsg('name','Invalid name. You must enter non empty name, minimal 5 characters, include letter and space only',2);
    return false;
  }
  if(name.length<5){
	inlineMsg('name','Invalid name. You must enter non empty name, minimal 5 characters, include letter and space only',2);
    return false;
  }
  if(!(name.match(nameRegex))){
	inlineMsg('name','Invalid name. You must enter non empty name, minimal 5 characters, include letter and space only',2);
    return false;
  }
  if(username == "") {
    inlineMsg('username','Invalid username. You must enter non empty username, minimal 5 characters, include letters, numbers, . , _ only',2);
    return false;
  }
  if(username.length<5){
    inlineMsg('username','Invalid username. You must enter non empty username, minimal 5 characters, include letters, numbers, . , _ only',2);
    return false;
  }
  if(!(username.match(usernameRegex))){
	inlineMsg('username','Invalid username. You must enter non empty username, minimal 5 characters, include letters, numbers, . , _ only',2);
    return false;
  }
  if((password=="") || (password!=confpassword) || password.length<6 ){
	inlineMsg('password','Invalid password. You must enter non empty username, minimal 6 characters',2);
    return false;
  }
  if(date==""){
	inlineMsg('date','Invalid date. YYYY-MM-DD',2);
    return false;
  }
  if(!(date.match(dateRegex))){
	inlineMsg('date','Invalid date. YYYY-MM-DD',2);
    return false;
  }
  if(email == "") {
    inlineMsg('email','Invalid email.',2);
    return false;
  }
  if(!(email.match(emailRegex))){
	inlineMsg('email','Invalid email.',2);
    return false;
  }
  if((location == "") || (location.length<5)){
	inlineMsg('location','Invalid location. Minimal 5 characters',2);
    return false;
  }
  return true;
}

function validatelogin(form){
     var username = form.username.value;
     var password = form.password.value;
     if(username==""){
         inlineMsg('username','Fill username textbox');
         return false;
     }
     if(password==""){
         inlineMsg('password','Fill password textbox');
         return false;
     }
     return true;
}

// START OF MESSAGE SCRIPT //

var MSGTIMER = 20;
var MSGSPEED = 5;
var MSGOFFSET = 3;
var MSGHIDE = 3;

// build out the divs, set attributes and call the fade function //
function inlineMsg(target,string,autohide) {
  var msg;
  var msgcontent;
  if(!document.getElementById('msg')) {
    msg = document.createElement('div');
    msg.id = 'msg';
    msgcontent = document.createElement('div');
    msgcontent.id = 'msgcontent';
    document.body.appendChild(msg);
    msg.appendChild(msgcontent);
    msg.style.filter = 'alpha(opacity=0)';
    msg.style.opacity = 0;
    msg.alpha = 0;
  } else {
    msg = document.getElementById('msg');
    msgcontent = document.getElementById('msgcontent');
  }
  msgcontent.innerHTML = string;
  msg.style.display = 'block';
  var msgheight = msg.offsetHeight;
  var targetdiv = document.getElementById(target);
  targetdiv.focus();
  var targetheight = targetdiv.offsetHeight;
  var targetwidth = targetdiv.offsetWidth;
  var topposition = topPosition(targetdiv) - ((msgheight - targetheight) / 2);
  var leftposition = leftPosition(targetdiv) + targetwidth + MSGOFFSET;
  msg.style.top = topposition + 'px';
  msg.style.left = leftposition + 'px';
  clearInterval(msg.timer);
  msg.timer = setInterval("fadeMsg(1)", MSGTIMER);
  if(!autohide) {
    autohide = MSGHIDE;  
  }
  window.setTimeout("hideMsg()", (autohide * 1000));
}

// hide the form alert //
function hideMsg(msg) {
  var msg = document.getElementById('msg');
  if(!msg.timer) {
    msg.timer = setInterval("fadeMsg(0)", MSGTIMER);
  }
}

// face the message box //
function fadeMsg(flag) {
  if(flag == null) {
    flag = 1;
  }
  var msg = document.getElementById('msg');
  var value;
  if(flag == 1) {
    value = msg.alpha + MSGSPEED;
  } else {
    value = msg.alpha - MSGSPEED;
  }
  msg.alpha = value;
  msg.style.opacity = (value / 100);
  msg.style.filter = 'alpha(opacity=' + value + ')';
  if(value >= 99) {
    clearInterval(msg.timer);
    msg.timer = null;
  } else if(value <= 1) {
    msg.style.display = "none";
    clearInterval(msg.timer);
  }
}

// calculate the position of the element in relation to the left of the browser //
function leftPosition(target) {
  var left = 0;
  if(target.offsetParent) {
    while(1) {
      left += target.offsetLeft;
      if(!target.offsetParent) {
        break;
      }
      target = target.offsetParent;
    }
  } else if(target.x) {
    left += target.x;
  }
  return left;
}

// calculate the position of the element in relation to the top of the browser window //
function topPosition(target) {
  var top = 0;
  if(target.offsetParent) {
    while(1) {
      top += target.offsetTop;
      if(!target.offsetParent) {
        break;
      }
      target = target.offsetParent;
    }
  } else if(target.y) {
    top += target.y;
  }
  return top;
}

// preload the arrow //
if(document.images) {
  arrow = new Image(7,80); 
  arrow.src = "../img/msg_arrow.gif"; 
}
